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The crews of Submarine Divisions 9 & 14 line the decks of their boats (20 in all) at the Submarine base at Pearl Harbor on 12 December 1930.R-1 (SS-78), R-2 (SS-79), R-3 (SS-80), R-4 (SS-81),R-5 (SS-82),R-6 (SS-83),R-7 (SS-84),R-8 (SS-85),R-9 (SS-86),R-10 (SS-87),R-11 (SS-88),R-12 (SS-89),R-13 (SS-90),R-14 (SS-91),R-15 (SS-92),R-16 (SS-93),R-17 (SS-94),R-18 (SS-95),R-19 (SS-96) & R-20 (SS-97).
All the R-boats were to leave the base where they had been serving for upwards of 8 years and transfer to the East coast to be decommissioned over the next 3 years. The only identifiable boat is the R-16.

These World War submarines, [R-boats] tied up in the Navy Yard in Philadelphia for a dozen years, are being reconditioned and some are already in active service again, it was announced 10 January 1941. This picture shows them as they appeared before the repair program began.

This air view of Portsmouth Navy Yard taken just after the end of WW II shows the main shipbuilding shed which enabled construction to continue unimpeded by the Maine winters. The shed was widened to add two ways in 1941, and a fifth was squeezed in a year later. Drydocks No. 1 (left) & 2 (far right) contain six fleet submarines, while three R-boats are moored in the foreground. The Pompano (SS-491) would have been under construction in the first ways on the left hand corner of the main shipbuilding shed.